2,454 research outputs found
Design and Implementation of Wireless Communication Network System for a Hospital Based on Triple Play
随着无线通信技术的持续发展,以及通信业务应用的不断推广,己有多 种无线通信网络投入到实践应用中。而无线通信网络的覆盖重心也从广阔的 室外空间转向了室内,室内覆盖成为了运营商、用户共同关注的焦点。然而 不同于室外环境,室内环境有更多限制,也更为复杂,这使得要解决室内无线覆盖的系统间干扰问题变得十分困难。 本文旨在通过对室内无线综合分布系统的研究,为室内无线通信网络的建设提供一定的参考经验。本文就WCDMA&PHS&WLAN室内无线综合分布系统的可行性进行了研究(本文的3G系统将选择WCDMA作为研究对象),从无线通信系统间的干扰原理分析入手,重点研究了WCDMA&PHS&WLAN三个系统...With the continuous development of wireless communication technology, as well as the continuous promotion of communication business applications, has a variety of wireless communication networks into practical applications. And the coverage of the wireless communication network is also from the vast outdoor space to the indoor, indoor coverage has become the focus of operators and users of common ...学位:工学硕士院系专业:软件学院_软件工程学号:X201323067
响 Impact on the apoptosis, invasion, proliferation ET-1 interfere with the formation of lung cancer
摘要 目的: 肺癌是最常见的恶性肿瘤之一,威胁着全世界人民生命和健康。同时它也是世界上发病率和死亡率增长最快的疾病之一。而且大多数肺癌患者到晚期才被诊断发现,在现阶段肺癌的治疗中,它仍然是无法治愈的。Endothelin(ET),由内皮细胞合成,是一种生物活性肽,是一种强烈的血管收缩剂,具有很强的收缩血管作用,随着对内皮素研究的不断深入,人们发现内皮素与肿瘤关系密切,对肿瘤细胞的生长、增殖、转移、凋亡及化学耐药等都方面都有影响。ET能够产生细胞生长因子可以促进肿瘤DNA合成,基因表达和肿瘤细胞增殖。ET有21种氨基酸组成,有研究发现,内皮素家族有四个同分异构体亚型包括ET-1ET-2ET-...Abstract Lung cancer is one of the most common malignant tumor, which is threatening the people's life and health around the world. It is also one of the fastest growing disease process lead to morbidity and mortality. Most patients diagnosed lung cancer in late stage. At present, the lung cancer could not be cured. Endothelin (ET), synthesized from endothelial cells, is a kind of biological act...学位:医学硕士院系专业:医学院_内科学学号:2452012115314
Effect of Benzalkonium Chloride on Corneal Epithelial Barrier Function and Possible Mechanisms of Benzalkonium Chloride Inhibiting Corneal Endothelial Gap Junction Intercellular Communication
第一部分:局部应用前列腺素类药物对兔角膜上皮细胞屏障功能的影响 目的:苯扎氯铵(BAK)是滴眼液中最常用的防腐剂之一,大量的临床研究发现,局部长期使用含BAK的眼部制剂会出现很多眼部不适症状。含BAK的前列腺素类药物是治疗开角性青光眼的一线药物,临床上患者往往需要长期使用,易导致眼睛干涩,结膜充血等等,然而其作用机制还不是非常清楚。紧密连接与粘着连接等构成了角膜上皮抵御外界病原微生物入侵的第一道生理屏障,对角膜正常生理功能的维持具有非常重要的作用。本研究拟探讨局部应用前列腺素类药物对角膜上皮细胞屏障功能的影响及其作用机制。 方法:新西兰大白兔被随机的分成4组,每组12只,右眼为药物处理组,...Part1 Effect of Topical Application of Commercial Prostaglandin (PG) Analogs on Rabbit Corneal Epithelial Barrier Function Purpose:BAK is one of the most common preservative in eye preparations,Prostaglandin (PG) analogs, including latanoprost, travoprost, and bimatoprost, are currently the most commonly used topical ocular hypotensive medications. The purpose of this study was to investigate the...学位:理学博士院系专业:医学院_生理学学号:2452012015397
湘中山地土壤线虫(Nematoda)生态地理群的研究
作者对湖南南岳衡山和长沙岳麓山土壤线虫进行了两年多的定位研究,共获得18511条土壤线虫标本.经分类鉴定,计有24个种,分属6目10科18届
Study on site selection and economic evaluation of mine YJL
目前,全球矿产品价格低靡,矿山企业生存难度急剧增加,要想在市场得以生存,矿山企业必须提升自身市场竞争力。矿山采选厂址的地理位置,是矿山总图合理及规范化布局及各技术方案的基础。选址的技术性及经济性,直接影响矿山企业的生产能力、运营成本、管理难度及经济效益。因此采用科学先进的设计方案、制定清晰的环保措施、以及较为准确的评估项目的经济性,是使矿山企业提高竞争力的重要手段。 本文首先根据矿区水文地质条件及地形地貌、矿体上下盘位置、地表监测带和尾矿库位置等影响因素,圈定并粗选出三个备选采选厂址。其次借鉴国内外文献的研究成果,釆用基于熵权法的模糊综合评价方法对YJL矿山项目备选采选厂址进行优选,并围绕优...At present, the price of mineral products is very low, the difficulty of the survival of mining enterprises increased dramatically, in order to survive in the market, the mining enterprises must enhance their competitiveness. The site of plant area is the basis of the reasonable and standardized layout of the mine and the technical scheme. The technology and economy selection, directly affect the ...学位:工程硕士院系专业:管理学院_工程硕士(项目管理)学号:X201315303
The Construction of Higher Education Service System in the Process of China’s Urbanization——A Case Study of Guangdong Province
城市化是通往现代化的必经之路。2014年3月16日,《国家新型城镇化规划(2014-2020年)》发布,我国的城市化被赋予了新的使命和涵义。在此背景下,我国的高等教育也将面临诸多新的要求与挑战,因为“人的城市化”的实现离不开高等教育服务体系的支撑。那么,在现阶段的城市化进程中,我国的高等教育应该如何发展?相关各方应该如何针对城市化进程中的问题开展相应的高等教育服务供给活动?如何才能在城市化进程中构建一个合理的高等教育服务体系? 基于这些问题,本研究选取我国的广东省作为研究对象,采用文献研究法、比较研究法、统计分析法、个案分析法对广东省城市化进程中的高等教育服务体系构建进行了研究,研究目的在于...Urbanization is the only way which must be passed to modernization. “National Plan on New Urbanization”was published on 16th, March,2014. Therefore,China’s urbanization has been given new mission and meaning. Under this background, China’s higher education will face a lot of new demands and challenges, for the realization of “urbanization of human” needs the support of higher education service sys...学位:教育学博士院系专业:教育研究院_高等教育学学号:2572012015357
Effect of steric hindrance on the biodegradation of dissolved methyl-phenanthrene
以菲(Phe)和甲基菲(MP:1-MP、3-MP、4-MP、9-MP)为研究对象,运用同步荧光法研究微生物Novosphingobium; pentaromativorans; US6-1对5种溶解态多环芳烃(PAHs)的降解特性.结果显示:MP在8*10~(-7),1.2*10~(-6)mol/L2种浓度下,其生物降解; 过程符合零级动力学,降解速率均为:4-MP<9-MP<1-MP<3-MP;5种PAHs的最大生物降解速率同理论最大跨膜通量存在良好的线性关系;N; aN_3对Phe降解速率影响较小,但抑制MP降解且抑制程度与取代基位置有关.The biodegradation of dissolved phenanthrene (Phe) and; methyl-phenanthrene (MP), including 1-MP, 3-MP, 4-MP and 9-MP by the; bacterium Novosphingobium pentaromativorans US6-1was individually; studied using synchronous fluorescence spectrometry. The biodegradation; of MP was adequately described by zero-order kinetics at two; concentrations, i.e., 8*10~(-7)mol/L and 1.2*10~(-6)mol/L. The rates of; biodegradation were generally in the following order:; 4-MP<9-MP<1-MP<3-MP. There was a good linear relationship between the; measured maximum biodegradation rates and the theoretical maximum; transmembrane fluxes. The addition of NaN_3exerted little effects on the; biodegradation of Phe but inhibited that of MP, with the degree of; inhibition dependent on the position of the methyl substituent.国家自然科学基金资助项目; 国家海洋局海洋溢油鉴别与损害评估技术重点实验室开放基金资助项目; 高等学校博士学科点专项科研基金资助项
The Research of Bilingual Word Clustering in Alignment Template Statistical Translation Model
基于统计的方法是当前机器翻译领域主流的研究方向之一,其中对齐模板统计翻译模型是效果最好的一个统计模型,而双语词聚类在对齐模板统计模型参数训练中占有十分重要的地位。本文首先综述了目前统计机器翻译的研究现状,简要介绍了几种不同的统计机器翻译模型。接着详细介绍了对齐模板的统计翻译模型及其模型参数训练。针对参数训练中的双语词聚类,在原来非层次聚类的基础上,给出了双语层次聚类的算法,同非层次聚类相比聚类的效果有一定的提高;又结合了两种算法的思想,提出了一种新的混合算法,新算法聚类的效果又有进一步的提高。为了确定最优的聚类个数,引入了最小描述长度的评价标准,对不同聚类个数的多个模型,选择其中描述长度最小的...Statistical machine translation is one of the main research directions in machine translation research field. The statistical model of alignment template is the one of best of statistical machine translation models. And bilingual word clustering plays a key role in the parameter training of alignment template. Firstly, this thesis summarized the status of statistical machine translation a...学位:工学硕士院系专业:计算机与信息工程学院计算机科学系_计算机应用技术学号:20022805
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